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(11) | EP 3 995 369 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | SYSTEMS AND METHODS FOR PRESSURE CONTROL MIXED MODE FOR BRAKING OPERATION |
| (57) A brake control system of the present disclosure calibrates a servo valve (421, 42r)
and calculates a calibrated transfer function associated with the servo valve for
precise braking in open-loop mode. The calibration steps may include determining i)
whether an aircraft is on a ground surface, ii) whether the aircraft is not moving
relative to the ground surface, and iii) whether braking is applied to a brake system
of the aircraft. The brake control unit may calibrate the servo valve in response
to the brake control unit determining that i) the aircraft is on the ground surface,
ii) the aircraft is not moving relative to the ground surface, and iii) the braking
is not applied to the brake system of the aircraft. The calibration process includes
sending two or more test currents to the servo valve, and determining braking pressures
associated with those test currents to calculate the transfer function.
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